Machine tool geometric error and rotary table rotation angle positioning error verification device and method

Abstract

The invention relates to the verification of the geometric error of a multi-axis numerical control machine tool and the positioning error of a rotary table rotation angle, and proposes a multi-axis numerical control machine tool geometric error verification method with high efficiency and high precision. According to a numerical control machine tool geometric error and rotary table rotation anglepositioning error verification device provided by the technical scheme of the invention, an optical probe is arranged on a Z-axis moving part of the machine tool; a combined surface type reference member is fixed on a platform perpendicular to the Z-axis of the machine tool; a curved array and a planar array are arranged on the combined surface type reference member and above the combined surfacetype reference member; the optical probe comprises a laser, an aperture stop, a mirror, a beam splitting prism, an imaging lens, a CCD camera and a data processing module; and a collimation light beamemitted by the laser is collapsed into a thin straight beam by the aperture stop. The device and the method are mainly applied to the verification of the geometric error of the multi-axis numerical control machine tool and the positioning error of the rotary table rotation angle.

Description

technical field [0001] The invention relates to a verification method for the geometric error of a multi-axis numerically controlled machine tool and the angular positioning error of a rotary table, in particular to a verification method for the geometric error of a multi-axis numerically controlled machine tool and the angular positioning error of a rotary table based on a combined surface reference piece. Background technique [0002] Error verification of CNC machine tools includes error detection and error identification. Error detection and identification are not only the basis of error evaluation, but also an important part of machine tool accuracy evaluation, and another key technology for machine tool accuracy prediction and error compensation. [0003] In the field of machine tool error detection, widely used machine tool error detection instruments include laser interferometers and ballbars. Due to their own detection principles, these instruments have their own sh...

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Problems solved by technology

[0003] In the field of machine tool error detection, widely used machine tool error detection instruments include laser interferometers and ballbars. Due to their own detection principles, these instruments have their own shortcomings in the error detection of multi-axis CNC machine tools: such as The adjustment of the laser interferometer is complicated, and only one parameter can be obtained for one measurement. The operation requirements are high, it is difficult to realize automation and speed, and the price is expensive, which is not available in general enterprises; Step design and theoretical decoupling algorithm research have increased the difficulty, and the ballbar uses a magnetic base and a precision ball for contact measurement, which needs to be moved at a low speed to ensure measurement accuracy, and it is difficult to adapt to the rapid trend

The linear displacement method is one of the common methods, but the detection instrument of the linear displacement method is a laser interferometer, which cannot separate the verticality error and the roll angle error has a principle error, and cannot identify the geometric error of the rotating shaft.

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